fond of a factor? Urn yourself to become remains

[Dubslow]

Originally Posted by markr

M54676967 has a factor: 420411039467695302913223737
89 bits, but so smooth*
2^2 × 3 × 7 × 167 × 293 × 569 × 593 × 1327 × 2089

* I'd cue davieddy but he might choose Mancini over Santana.

Wow! Indeed, that is ridiculously awesome.

Here's the complete opposite: A factor so bumpy it's only by fluke that P-1 found it and not TF.

M56,028,041, k = 2^3 × 247309 × 13133213

[lorgix]

I just found my first GPU-factor:

M976212067 has a factor: 513655278767372311447 [TF:65:70:mfaktc 0.18 barrett79_mul32]
found 1 factor for M976212067 from 2^65 to 2^70 [mfaktc 0.18 barrett79_mul32]

[LaurV]

Welcome to the club! We wish you thousands of factors!
Be careful, is addictive!

[c10ck3r]

554808873006599188633 is a factor of M31954267!
K= 2^2 x 3 x 760367 x 951437
My first DCTF factor found :)

[TheJudger]

New personal record (9.83 "bits" bigger than my previous record): P-1 found a factor in stage #2, B1=515000, B2=10042500.
M55501499 has a factor: 4185864995365978016690272528312914075119 (131.62 Bits; k = 37709476958144662153091329373941 = 149 * 8623 * 17807 * 79579 * 145807 * 147139 * 965407)

Oliver

[chalsall]

Originally Posted by TheJudger

New personal record (9.83 "bits" bigger than my previous record): P-1 found a factor in stage #2, B1=515000, B2=10042500.
M55501499 has a factor: 4185864995365978016690272528312914075119 (131.62 Bits; k = 37709476958144662153091329373941 = 149 * 8623 * 17807 * 79579 * 145807 * 147139 * 965407)

Nice!!! A new record for GPU 72 too.

[c10ck3r]

504927967098232939441 is a factor of M6,687,383.
Found as part of the rerun of poorly factored exponents.
k=2^3x3x5x37x56,543x150,377

[TheJudger]

Only a few days after my new personal "factor size record" for P-1 factoring I've a new number two in my list:
P-1 found a factor in stage #2, B1=545000, B2=11581250.
M54945109 has a factor: 248355809127166139921362845673542274151 (127.54 Bits; k = 2260035639634149601208024227175 = 5 * 5 * 31 * 89 * 107 * 353 * 9437 * 60013 * 446951 * 3427093)

[lorgix]

A few cases of Brent-Suyama paying off:

P-1 found a factor in stage #2, B1=80000, B2=1500000.
UID: lorgix, M2139539 has a factor: 50417810253342889667777
k= 2^5*719*46747*10954717

P-1 found a factor in stage #2, B1=85000, B2=1742500.
UID: lorgix, M2294807 has a factor: 4743377217925125644071
k= 3^3*5*751*3851*2647063

P-1 found a factor in stage #2, B1=95000, B2=1947500.
UID: lorgix, M2442719 has a factor: 27573814760148300857
k= 2^2*37*907*42045967

P-1 found a factor in stage #2, B1=95000, B2=1947500.
UID: lorgix, M2477309 has a factor: 412991649168730738883201
k= 2^6*5^2*1723*8167*3702229

P-1 found a factor in stage #2, B1=95000, B2=1947500.
UID: lorgix, M2492143 has a factor: 189868506369595443867609863
k= 109*269*8663*74831*2004109

P-1 found a factor in stage #2, B1=95000, B2=1971250.
UID: lorgix, M2492389 has a factor: 65384728464585460900369
k= 2^3*3*7*1847*4703*8988337

P-1 found a factor in stage #2, B1=95000, B2=1923750.
UID: lorgix, M2433979 has a factor: 103825801661835930049
k= 2^5*3^2*47*193*8164147

P-1 found a factor in stage #2, B1=160000, B2=3680000.
UID: lorgix, M8186687 has a factor: 1321002082390776639208561
k= 2^3*3^2*5*2687*14771*5646577

And then a case of highly saturated B2:

P-1 found a factor in stage #2, B1=95000, B2=1947500.
UID: lorgix, M2444359 has a factor: 1588994437060952149274017
k= 2^4*3*31*41*197*13901*1945487

1945487/1947500 ~= 0.999

[KingKurly]

[Mon May 21 06:54:00 2012]
P-1 found a factor in stage #2, B1=285000, B2=6341250, E=6.
M43787581 has a factor: 4003395812858544808108690252822256209

---

M43787581 has factor 4003395812858544808108690252822256209 (121.59 bits)
k = 2^3 * 3^2 * 41 * 47 * 67 * 14083 * 22159 * 165601 * 95159089



Caught this during my sweep of doing P-1 on curtisc exponents that didn't get any in their first time around. I usually set tests saved to 1.1 and let slower machine pick them off. It only saves the double-check (assuming the first check was valid) but the bounds are adjusted downward, as appropriate... sometimes, you get lucky and find a factor anyway.

[Bdot]

This one was almost finished ...
Sure, each class has the same chances, but so far I had not noticed a success in the almost-final round.

got assignment: exp=57347131 bit_min=71 bit_max=72
Starting trial factoring M57347131 from 2^71 to 2^72 (8.34GHz-days)
  k_min = 20586759963000 - k_max = 41173519934847
Using GPU kernel "barrett15_75"
No checkpoint file "M57347131.ckp" found.
[date    time]     exp[TF bits]: percent   class #, seq        GHz    time |    ETA |    #FCs |      rate |SieveP. | CPU idle
[May 25 02:14] M57347131[71-72]:  99.17% 4581/4620,952/960   48.96 15.330s |  2m03s | 855.64M |  55.81M/s | 101050 |      0us =   0.00%
Result[00]: M57347131 has a factor: 2858577001937559485743

found 1 factor for M57347131 from 2^71 to 2^72 (partially tested) [mfakto 0.11 barrett15_75_4]
tf(): total time spent:  3h 59m 32.548s